Reproduction Phenology And Its Seed Germination Behavior Of Two Species From Chenopodiaceae

The xerophytic subshrub of Atriplex cana and Ceratoides latens were the main building group of arid areas. They were conducive to maintain the ecological balance. In this paper, we observed the flowering phenology, characteristics of growing fruits and seed germination. The main conclusions were as follows:(1) The Atriplex cana was blossoming in the June or July. It showed "persistent bloom" features. In the middle of August, the fruit begins growing. The temperature trend from July to November, shows a negative correlation with the seed weight, length and width. The bracts growth with seed and protect it.(2) The Ceratoides latens was blossoming in the July or August. In the middle of September, the fruit begins growing and the quality was increasing. With the temperature decrease in the September, the fruit become growth slow.(3) The suitable thermoperiods for germination of Atriplex cana is 20/30 ? and 25/35 ?. The seed germination rate was increased with the dry storage time in 2-8 months, than fall with the dry storage time after 10 months. Bracts block seed suction. It was significant effects on germination. Remove bracts can significantly improve the seed germination rate. The low concentration of salt solution does not affect germination. But the germination rate has negative correlation with the salt concentration when it is higer than 0.8 mol/L. Seeds incubated in NaCl at concentrations of 0.05–4.0 mol/L recovered after being transferred to distilled water. There are still some germination recovery rate.It is showed that after NaCl treatment part seeds can remain vigorous.(4) The suitable thermoperiods for germination of Ceratoides latens is 20/30 ? and 25/35 ?. In 10 months dry storage, the germination rate become faster with time by. Bracts have significant influence on the final seed germination rate. The removal of bracts can obviously promote the seed germination. Germination was not affected by NaCl at concentrations below 0.6 mol/L, and it was decreased by NaCl at higher concentrations. Seeds incubated in NaCl at concentrations recovered after being transferred to distilled water. The seeds of seed recovery after water germination rate less than 30%. It is showed that after NaCl treatment part of seeds can remain vigorous, others lost vigorous.